Features

Becomes as hard as firebrick when heat cured and is able to withstand 2,000º F

Does not contain asbestos

Each cartridge can cover approximately 99 linear feet with a 1/8" bead

Meets ASTM E136-79 and E72

Can be painted after curing

Available in three colors

Fits in any standard caulking gun

Properties:

Solvent: water

Consistency: gunnable paste

Flashpoint: 212º F

Dry Time: air dry for 24 hours

Heat Cure Temperature: 500º F

Need to make some minor fireplace repairs? If you're looking to patch broken firebrick or repoint a firebox's mortar joints, there's no better choice than this Rutland Fireplace Mortar. Heat curing allows this tough mortar to withstand temperatures as high as 2,000 degrees fahrenheit and become as hard as the firebrick you're using it on. A smooth texture and a cartridge that will fit into any standard caulking gun also make this mortar extremely easy to apply. You even have the option of painting this remarkable compound to match the finish of the firebrick once it has set.

Please Note: This mortar contains sodium silicate 1344-09-8. It should not be used without safety goggles and chemical resistant gloves.

What is the best way to heat cure it? How long does it take to heat cure?

1 Answer

Per our specialist, Collin, "After allowing the product to dry for at least 24 hours, you will need to build three consecutive fires of increasing intensity. It is best to build one fire per day, but the process can be rushed a bit, as long as the fireplace is given time to cool down completely in between fires. The first fire can be built just with kindling and only needs to achieve a couple hundred degrees at the surrounding firebox walls. The next two fires can be larger and should heat the walls to 300 to 400 degrees and 500 or over, respectively. By building fires in increasing intensity, this will help to keep the mortar from cracking or separating prematurely."

After allowing the product to dry for at least 24 hours, you will need to build three consecutive fires of increasing intensity. It is best to build one fire per day, but the process can be rushed a bit, as long as the fireplace is given time to cool down completely in between fires. The first fire can be built just with kindling and only needs to achieve a couple hundred degrees at the surrounding firebox walls. The next two fires can be larger and should heat the walls to 300 to 400 degrees and 500 or over, respectively. By building fires in increasing intensity, this will help to keep the mortar from cracking or separating prematurely.

I would recommend this item to a friend.

Worked well to replace mortar which had dried and fallen off around fireplace surround.

By kelly fromNHonJuly 16, 2015

I would recommend this item to a friend.

Rutland fireplace mortar

Great product! Cheaper than the local retail store.

By Tyler fromEuless, TXonFebruary 3, 2012

I would recommend this item to a friend.

Works perfect

I used the whole tube to repair and restore my fireplace brick finish, which were severely damaged and cracked and chipped from years of burning hot Oak wood. The mortar was easy to work with and shape, I let it cure for a week then had a small fire for 3 hours to cure it, and now its as hard as the original brick and is holding up very well. I will order this again in the future if I get bad bricks on other walls or areas of the fireplace.